1 <!DOCTYPE html>
2 <html>
3 <head lang="en">
4 <meta charset="UTF-8">
5 <title>随机验证码</title>
6 </head>
7 <body>
8 <span id="msg"></span>
9 <input type="button" value="刷新" onclick="show()">
10 <script>
11 function validateCode(n){
12 var s="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
13 var ret="";
14 for(var i=0;i<n;i++){
15 var index=Math.floor(Math.random()*62);
16 ret+= s.charAt(index);
17 // alert(Math.floor(Math.random()*62));
18 }
19 return ret;
20 }
21 function show(){
22 document.getElementById("msg").innerHTML=validateCode(5);
23 }
24 function renovates(){
25 document.location.reload();
26 }
27 window.onload=show;
28 </script>
29 </body>
30 </html>
